Rational Design Oxygen and Sulfur Dual-Doped 3D Hierarchical Porous Carbons for High-Performance Lithium-Sulfur Batteries. Issue 2 (1st January 2018)

• Record Type: Journal Article
• Authors: Cao, Zhaoxia; Zhang, Ruirui; Shi, Mengjiao; Zhu, Guangshuang; Yang, Mingguo; Zhang, Huishuang; Qiao, Yun; Yang, Shuting
• Is Part Of: Journal of the Electrochemical Society. Volume 165:Issue 2(2018)
• Page Start: A31
• Page End: A39
• Publication Date: 2018-01-01
• Subjects: Hierarchical carbon -- Li-S batteries -- Rational design; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.0041802jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : Oxygen and sulfur dual-doped 3D interconnected hierarchical porous carbons (HPCs) were synthesized via pyrolysis followed by chemical activation of natural alginate. The results showed that both an appropriate poristy and high level of S doping lead to the excellent electrochemical performance. The optimal HPC-Na-900/S composite exhibited outstanding electrochemical performance as cathode materials for Li-S batteries. Specially, the electrochemical performances of the resultant HPC/S composites change randomly with the surface area, pore volume except porosity and surface chemistry under the testing conditions. The porosity plays a more important role than surface area as well as pore volume which are the crucial parameters in designing of porous carbon, and only the ratio of these hierarchical pores reaches a specific range, the best battery performance can be achieved. The introduction of heteroatom are also key factors that determines the performance of lithium-sulfur batteries. This insight into the relation of microstructure and surface chemistry with battery performance can help to guide better understand and rationally design porous carbon hosts.